Path path = Paths.get("C:\Program Files\Java\jdk1.8.0_91"); AtomicInteger fileCount = new AtomicInteger(); Files.walkFileTree(path, new SimpleFileVisitor(){ @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { if (file.toFile().getName().endsWith(".jar")) { fileCount.incrementAndGet(); } return super.visitFile(file, attrs); } }); System.out.println(fileCount); // 724
